Regarding navigation, it is possible to enter a destination, search for POIs or set multiple waypoints with the vehicle in motion, the functionality is no different than when you are parked (unless they changed it for 2014, but I doubt it.) I use voice commands to enter addresses whenever I am on the go, it's a bit slow and chatty like you pointed out, but safer than punching letters and numbers on the touchscreen.
I love the LR4's high-intensity discharge headlights, I think they are phenomenally good and way better than any other car I have owned in the past, including my 2006 Sport which also had excellent HIDs. So, either the headlight clusters have been modified for the worse in 2014 - someone else reported they no longer have fill-in halogen high beams to supplement the xenons, so that may be the case - or something may have been wrong / misaligned in your loaner. I have adaptive headlights, but all that does is swiveling the HIDs left or right when steering - not very much to be honest, adaptive headlights have always seemed a bit gimmicky to me - the headlight clusters are otherwise identical. Your loaner had xenons, I am sure? Huge difference between halogens and HIDs.
The heated windshield is an acquired taste, I guess. The filaments sandwiched in the glass panes bothered me for about 5 minutes when I purchased my first Land Rover with this type of windshield back in 2005, then my eyes kinda trained themselves to focus beyond. I don't notice those lines at all anymore, day or night, rain or no rain. I have used the defrost function maybe twice (in Southern California, not too many chances to defrost anything here unless it's in the fridge...), it worked great.